Crossword Genius

Most inactive and poorly during Second International (8)

Ross

I believe the answer is:

stillest

'most inactive' is the definition.
('still' can be a synonym of 'inactive')

'poorly during second international' is the wordplay.
'poorly' becomes 'ill' ('ill' can be a synonym of 'poorly').
'during' means one lot of letters goes inside another.
'second' becomes 's' (common abbreviation).
'international' becomes 'test' (I've seen this before).
's'+'test'='stest'
'ill' put into 'stest' is 'STILLEST'.

'and' is the link.

(Other definitions for stillest that I've seen before include "Least disruptive" , "Most calm" , "least enterprising" .)

I've seen this clue in The Guardian.
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