Headlining performer will require some French wine and a hotdog at the end - they'll be famished (8)
I believe the answer is:
starving
'famished' is the definition.
(I've seen this in another clue)
'headlining performer will require some french wine and a hotdog at the end' is the wordplay.
'headlining performer' becomes 'star' (I've seen this in another clue).
'will require' means one lot of letters go next to another.
'some french wine' becomes 'vin' ('wine' in French).
'and' is a charade indicator (letters next to each other).
'at the end' indicates one should take the final letters.
The final letter of 'hotdog' is 'g'.
'star'+'vin'+'g'='STARVING'
'they'll be' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for starving that I've seen before include "feeling famished" , "Dying of hunger" , "certainly not scoffing" , "Suffering from lack of food" , "Ravenous, really hungry" .)