Buy another drink? It's a pleasure (5)
I believe the answer is:
treat
'buy' is the definition.
The answer and definition can be both to do with ownership as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?
'another drink? it's a pleasure' is the wordplay.
I cannot really see how this works, but
'another' could be 're' (I've seen this in other clues) and 're' is located in the answer.
'a' is within the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
A single letter 't' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for treat that I've seen before include "Entertain - minister - free entertainment" , "pay for another" , "Pay for - minister to - deal with" , "Something that causes special pleasure or delight" , "Try to heal" .)