Problem ship coming into sound (6)
I believe the answer is:
hassle
'problem' is the definition.
(I've seen this before)
'ship coming into sound' is the wordplay.
'ship' becomes 'ss'.
'coming into' is an insertion indicator.
'sound' becomes 'hale' ('hale' can be a synonym of 'sound'**).
'ss' going within 'hale' is 'HASSLE'.
(Other definitions for hassle that I've seen before include "argument" , "Colloquial harassment or annoyance" , "badger" , "Difficulty - dispute" , "Harass; pester" .)