Strengthens, supports (10)

I believe the answer is:

reinforces

I believe this clue is a double definition.

'strengthens' is the first definition.
(reinforcing is a kind of strengthening)

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

(Other definitions for reinforces that I've seen before include "Strengthens" , "supports" .)

I've seen this clue in The Mirror.

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