Show willingness to get away when supper's finished (5)
I believe the answer is:
offer
'show willingness' is the definition.
'offer' can be an answer for 'show' (I've seen this before). I'm not certain of the 'willingness' bit.
'get away when supper's finished' is the wordplay.
'get' is a charade indicator (letters next to each other).
'away' becomes 'off' (synonyms).
'when' becomes 'e' (I've seen this in other clues).
'supper's finished' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'off'+'e' is 'offe'.
'offe'+'r'='OFFER'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for offer that I've seen before include "Provide; reduced price" , "Proposition" , "Bid; proposal" , "Tender - proposal" , "Present to or make a bid" .)