Available for one agitated about fine (2,5)
I believe the answer is:
on offer
'available' is the definition.
(I've seen this before)
'for one agitated about fine' is the wordplay.
'agitated' indicates an anagram.
'about' is an insertion indicator.
'fine' becomes 'f' (abbreviation).
'for'+'one'='forone'
'forone' with letters rearranged gives 'onofer'.
'onofer' placed around 'f' is 'ON OFFER'.
(Other definitions for on offer that I've seen before include "At special price" , "For sale at specified price" , "is made cheaper?" , "available for less" , "For sale at a certain price" .)