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Small step men exploring this would take (5)

Ross

I believe the answer is:

space

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'men exploring this would take' is the definition.
The definition suggests a singular noun which matches the answer.

'small step' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'step' becomes 'pace' (pace is a kind of step).
's'+'pace'='SPACE'

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(Other definitions for space that I've seen before include "Free area" , "Gap between words" , "-- Capsule; -- bar" , "Expanse" , "Blank" .)

I've seen this clue in The Sun.
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