Supports higher locks (7)

I believe the answer is:

upholds

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'supports' is the definition.
(upholding is a kind of supporting)

'higher locks' is the wordplay.
'higher' becomes 'up'.
'locks' becomes 'holds' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'up'+'holds'='UPHOLDS'

Can you help me to learn more?

(Other definitions for upholds that I've seen before include "Advocates" , "Supports, the law say" , "Maintains" .)

I've seen this clue in the Sydney Morning Herald.

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