Supports bar locks (10)
I believe the answer is:
buttresses
'supports' is the definition.
(buttress is a kind of support)
'bar locks' is the wordplay.
'bar' becomes 'but' (I've seen this in other clues).
'locks' becomes 'tresses' (I've seen this before).
'but'+'tresses'='BUTTRESSES'
(Another definition for buttresses that I've seen is " parts of building".)
I've seen this clue in The Guardian.
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