Crossword Genius

Reinforce smooth catch (7)

Ross

I believe the answer is:

sandbag

I'm a little stuck... Click here to teach me more about this clue!

'reinforce' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps you can see a link between them that I don't see?

'smooth catch' is the wordplay.
'smooth' becomes 'sand' (sanding is a kind of smoothing).
'catch' becomes 'bag' (synonyms).
'sand'+'bag'='SANDBAG'

Can you help me to learn more?

(Other definitions for sandbag that I've seen before include "Flood barrier builder" , "heavy weight" , "defensive article" , "One piled for flood protection" , "Flood defence" .)

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