How to serve a friend with the last portion of fish (7)
I believe the answer is:
finally
'how to serve a' is the definition.
I can't judge whether this definition defines the answer.
'friend with the last portion of fish' is the wordplay.
'friend' becomes 'ally' (an ally is a friend or supporter).
'with' says to put letters next to each other.
'the last' becomes 'f' (I've seen this in other clues).
'portion of fish' becomes 'in' (I can't justify this - if you can you should give a lot more credence to this answer).
'f'+'in'='fin'
'ally' after 'fin' is 'FINALLY'.
Can you help me to learn more?
(Other definitions for finally that I've seen before include "At last" , "for ever" , "when all is said and done" .)