Inconstant crawler? (3)

I believe the answer is:

ant

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'crawler?' is the definition.
(an ant crawls)

'inconstant' is the wordplay.
'ANT' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ant that I've seen before include "maybe in hill" , "` `Go to the ... thou sluggard' '" , "Worker on the hill" , "one living in colonies" , "Dec's long-time partner" .)

I've seen this clue in the Evening Standard.

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