Struggle against pitch that's hard to deal with (5,10)
I believe the answer is:
sales resistance
'deal with' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'struggle against pitch that's hard' is the wordplay.
I cannot quite see how this works, but
'pitch' could be 'sales' (synonyms) and 'sales' is present in the answer.
'struggle against' could be 'resist' (resisting is a kind of struggling against) and 'resist' is found within the answer.
The remaining letters 'ance' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for sales resistance that I've seen before include "Reluctance to buy" , "Opposition shown to rep" .)