Swim before one can walk? (5)

I believe the answer is:

crawl

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

This clue might be a double definition.

'swim' is the first definition.
(crawling is a kind of swimming)

'before one can walk?' is the second definition.
'crawl' can be an answer for 'walk?' (thesaurus). I'm not sure about the 'before one can' bit.

Can you help me to learn more?

(Other definitions for crawl that I've seen before include "Slow advance" , "Scramble on all fours" , "fawn" , "inch" , "be overrun" .)

I've seen this clue in The Sun.

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