Seaman loves concocted excuse (7)
I believe the answer is:
absolve
'excuse' is the definition.
(I've seen this before)
'seaman loves concocted' is the wordplay.
'seaman' becomes 'ab' (short for able seaman).
'concocted' indicates anagramming the letters.
'loves' is an anagram of 'solve'.
'ab'+'solve'='ABSOLVE'
(Other definitions for absolve that I've seen before include "Declare to be free from blame" , "Declare (someone) blameless" , "Lob vase (anag.)" , "Discharge" , "Grant remission of a sin" .)