Yearn for a singular garment! (4)
I believe the answer is:
pant
'yearn' is the definition.
(to pant for something is to yearn for or crave it)
'a singular garment' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for pant that I've seen before include "Struggle for breath" , "Breath noisily from exertion" , "Breathe heavily" , "Sound out of breath" , "Long" .)