The man pursuing corporation account to complain (9)
I believe the answer is:
bellyache
'complain' is the definition.
(bellyaching is a kind of complaining)
'the man pursuing corporation account' is the wordplay.
'the man' becomes 'he'.
'pursuing' means one lot of letters go next to another.
'corporation' becomes 'belly' ('belly' can be a synonym of 'corporation'**).
'account' becomes 'ac'.
'belly'+'ac'='bellyac'
'he' put after 'bellyac' is 'BELLYACHE'.
'to' acts as a link.
(Other definitions for bellyache that I've seen before include "protest" , "complain" , "Gripe" , "Gut pain" , "Beef" .)