A girl and a boy had a meal together (5)
I believe the answer is:
dined
'together' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives occasionally mean the same thing.
'a girl and a boy had a meal' is the wordplay.
I cannot quite see how this works, but
'girl' could be 'di' and 'di' is present in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
'boy' could be 'ed' (short for Edward) and 'ed' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dined that I've seen before include "Ate a meal" , "Had supper" .)