Steep price to back us at wrestling (8)
I believe the answer is:
saturate
'steep' is the definition.
(I've seen this in another clue)
'price to back us at wrestling' is the wordplay.
'price' becomes 'rate' (I've seen this in another clue).
'to back' says to put letters next to each other (some letters go at the back of others).
'wrestling' indicates anagramming the letters.
'us'+'at'='usat'
'usat' with letters rearranged gives 'satu'.
'rate' put after 'satu' is 'SATURATE'.
(Other definitions for saturate that I've seen before include "Oversupply" , "Make thoroughly wet, soak" , "flood" , "steep" , "Drench thoroughly, soak" .)