Trim sailor, somewhere high (7)

I believe the answer is:

abridge

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'trim' is the definition.
(I've seen this before)

'sailor somewhere high' is the wordplay.
'sailor' becomes 'ab' (abbreviation for able seaman).
'somewhere high' becomes 'ridge' (I can't justify this - if you can you should believe this answer much more).
'ab'+'ridge'='ABRIDGE'

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(Other definitions for abridge that I've seen before include "Curtail" , "(US) cattle-pen" , "Concentrate" , "Crop" , "Abbreviate, contract" .)

I've seen this clue in The Telegraph.

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