Grab naughty child on ship (7)
I believe the answer is:
impress
'grab' is the definition.
(thesaurus)
'naughty child on ship' is the wordplay.
'naughty child' becomes 'imp' (informal term for a misbehaving child).
'on' becomes 're' ('on' can be mean 'with reference to').
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'imp'+'re'+'ss'='IMPRESS'
(Other definitions for impress that I've seen before include "Make mark on or earn admiration" , "Simpers (anag.)" , "look big?" , "Earn good opinion of, or stamp" , "Make mark on, cause to admire" .)