Guardian Genius 198 - Last 2 + 2 To Parse

[JJ109]

19d Half-hearted girl's stories (3) A _ A
29d Maybe Glaswegian home around capital (4) I _ I _
(I wondered about Ilid which is Dili reversed but could not find a word ilid!)

There is another rule also, for 19d if you swap the last A for an I, it must form a word (nothing to do with the clue though) and for 29d if you remove the first I and replace it with an H, it must again form a dictionary word.

2 to help parse please
12a Old imposters to put in entertaining places (7) F _ I _ O _ S
The answer is obviously FAITORS (an obsolete word for impostors), but how does the rest parse. please?
4d Novice in love, slowing up (4) _ I _ O
I presume TIRO (novice) but don't see the rest.

Many thanks

[JJ109]

oops for 19d forget the A for an I bit - that doesn't apply, but for 29d the H for the first I does!

[scorpiojo]

19 An(n)a

[mallyh]

12a to in fairs

[scorpiojo]

Fairs (entertaining places) around to

[scorpiojo]

29 Iain - in (home) around A1

[JJ109]

Thanks Jo, for ana - I was on totally the wrong wavelength there!
Thanks also Mallyh - I don't know how I missed that, I've been looking at that for ages!

[JJ109]

Thanks again Jo for the other two, Hain is indeed a word!

[mallyh]

4 rit is an abbreviation for ritenuto ,slowing in music

[JJ109]

Thanks again Mallyh = finished.
Thanks to you both, shame I can only give 1 b/a. Mally next time it will be Jo's turn!!!

[scorpiojo]

Mally deserves it :-)

[mallyh]

thankyou x:-)