Crossword Genius

Force hard when cold (6)

Ross

I believe the answer is:

frigid

'cold' is the definition.
(similar in meaning)

'force hard' is the wordplay.
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'hard' becomes 'rigid' (I've seen this before).
'f'+'rigid'='FRIGID'

'when' is the link.

(Other definitions for frigid that I've seen before include "Lacking affection or warmth" , "Passionless, unresponsive" , "Sexually unresponsive" , "Very cold; formal in behaviour" , "Glacial" .)

I've seen this clue in The Hindu.
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