Available for one disturbed about fine (2,5)
I believe the answer is:
on offer
'available' is the definition.
(eg available for sale)
'for one disturbed about fine' is the wordplay.
'disturbed' indicates anagramming the letters (the order of letters is disturbed).
'about' indicates putting letters inside.
'fine' becomes 'f' (abbreviation e.g. condition of old coins, books).
'for'+'one'='forone'
'forone' is an anagram of 'onofer'.
'onofer' going around 'f' is 'ON OFFER'.
(Other definitions for on offer that I've seen before include "available for less" , "For sale at specified price" , "is made cheaper?" , "At special price" , "For sale at a certain price" .)