1a Fox burying head in mound (4)
T _ _ P
2d Soldier joining revolutionary group of vassals (6)
_ AN_ ED
In addition the 3rd letter of 1a is the 1st letter of 2d
27d Pike follows acting typical of seniors in Dad's Army (4)
A _ _ D
29a Orcadian gullies, reverse of steep? I'll plunge in (4)
_IO_
In addition the 2nd letter of 27d is the first letter of 29a
Last one parsing required, please
20a Royal favourite in power cutting do (6)
MI _ ION
Presumably Minion, but why?