Aboard jet, accessory maker wants hot flannel (8)
I believe the answer is:
flattery
'flannel' is the definition.
(I've seen this before)
'aboard jet accessory maker wants hot' is the wordplay.
'aboard' indicates putting letters inside.
'jet' becomes 'fly' (I've seen this in another clue).
'accessory maker' becomes 'hatter' (someone who makes hats).
'wants' suggests deleting specific letters ('want' can mean 'lack').
'hot' becomes 'h' (abbreviation eg on taps).
'hatter' with 'h' removed is 'atter'.
'fly' going around 'atter' is 'FLATTERY'.
(Other definitions for flattery that I've seen before include "butter" , "Blarney" , "Excessive or insincere praise" , "''Imitation is the sincerest form of . . . . . . . .'' (8)" , "Obsequious praise" .)