Move slowly in chain (4)

I believe the answer is:

inch

'move slowly' is the definition.
(I've seen this in another clue)

'in chain' is the wordplay.
'chain' becomes 'ch' (I've seen this in other clues).
'in'+'ch'='INCH'

(Other definitions for inch that I've seen before include "Progress slowly" , "Edge along" , "amount of rainfall?" , "2.54 centimetres" , "Rare bird follower" .)

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

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