Impolite sailor put out around mid-afternoon (6)
I believe the answer is:
abrupt
'impolite' is the definition.
(I've seen this before)
'sailor put out around mid-afternoon' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman**).
'out' indicates an anagram (out can mean wrong or inaccurate).
'around' is an insertion indicator.
'mid' says to take the centre.
The middle of 'afternoon' is 'r'.
'put' with letters rearranged gives 'upt'.
'upt' placed around 'r' is 'rupt'.
'ab'+'rupt'='ABRUPT'
(Other definitions for abrupt that I've seen before include "Sudden and unexpected" , "Short in manner" , "Sudden, maybe discourteous" , "Short and rude" , "Brusque, curt" .)