Times Jumbo Cryptic 1269

[Neily]

Really struggling with this puzzle. Very grateful for any help with these four clues please.
1dn: "Supply of coal and grub passes through here (4,5)." I. Have F---, M----.
3dn: "Valiant defence of the briefly popular wine brand (4,3,4)." I have T---,A-D,---E.
18ac: "Hawk kept in pocket, just for show? (8)." I have -I---L-Y.
44ac: "Teacher from faculty, principal of institute (6)." I have -E-S-I.

[cashier]

1d. Food canal

[cashier]

3. Thin red line

[cashier]

44 sensei

[Lie-in King]

1d Food canal - anag (supply) 'of coal and'
3d Thin red line - 'th(e)' (briefly) + 'in (popular) red line'
18a Tinselly - 'sell' (hawk, in) 'tiny' (pocket)
44a Sensei - 'sense' (faculty) + 'i(nstitute)' (principal)

[PeterHillman]

Food Canal
This red line
Tinselly
Sensei
It was a bit of a *** this week!!

[Neily]

Many thanks all! Clearly I am all over the place this time.