Crossword Genius

Buttress with ends of segment touching, and no good, therefore (10)

Ross

I believe the answer is:

strengthen

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'buttress' is the definition.
(thesaurus)

'ends of segment touching and no good therefore' is the wordplay.
'ends of segment' becomes 'st' (I am not sure about this - if you are sure you should believe this answer much more).
'touching' becomes 're' (re can mean touching or regarding).
'and' is a charade indicator (letters next to each other).
'no good' becomes 'ng' (abbreviation for no and good).
'therefore' becomes 'then' (I've seen this in another clue).
'st'+'re'+'ng'+'then'='STRENGTHEN'

'with' acts as a link.

Can you help me to learn more?

(Other definitions for strengthen that I've seen before include "Brace" , "Toughen up" , "Make more powerful" , "rally" , "Build up" .)

I've seen this clue in The Times.
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