Crossword Genius

Reinforce lock on bar (8)

Ross

I believe the answer is:

buttress

'reinforce' is the definition.
(thesaurus)

'lock on bar' is the wordplay.
'lock' becomes 'tress' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'bar' becomes 'but' (I've seen this in other clues**).
'tress' put after 'but' is 'BUTTRESS'.

(Other definitions for buttress that I've seen before include "It may be flying" , "Reinforce" , "support for Notre Dame?" , "strengthening side" , "that goes flying round the cathedral?" .)

I've seen this clue in The Telegraph.
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