Towards back seat repaired by sailors (6)

I believe the answer is:

astern

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'towards back' is the definition.
I can't judge whether this defines the answer.

'seat repaired by sailors' is the wordplay.
'repaired' indicates an anagram.
'by' is a charade indicator (letters next to each other).
'sailors' becomes 'RN' (abbreviation for Royal Navy).
'seat' anagrammed gives 'aste'.
'aste'+'rn'='ASTERN'

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(Other definitions for astern that I've seen before include "following behind vessel" , "Behind at sea" , "Aft" , "Ran set (anag.)" , "Towards the rear of boat" .)

I've seen this clue in The Sun.

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