Something to wear, for the director (7)
I believe the answer is:
trainer
'director' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'something to wear for the' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
The remaining letters 'rainer' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for trainer that I've seen before include "Soft shoe; simulator" , "Sports/casual shoe" , "Sports shoe" , "He assists athlete to become fit" , "Sports instructor" .)