A support on land (6)

I believe the answer is:

ashore

'on land' is the definition.
(synonyms)

'a support' is the wordplay.
'support' becomes 'shore' (I've seen this before).
'a'+'shore'='ASHORE'

(Other definitions for ashore that I've seen before include "in port?" , "Off the boat" , "On land (as opposed to the sea)" , "on terra firma" , "Toward land from the sea" .)

I've seen this clue in The Guardian.

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