Gasping, presumably dirty clothes on (10)
I believe the answer is:
breathless
'gasping' is the definition.
(similar in meaning)
'presumably dirty clothes on' is the wordplay.
I cannot quite see how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for breathless that I've seen before include "Spent" , "panting?" , "Short-winded" , "Gasping for air" , "Still" .)