Cold, fat-headed and stiff (6)

I believe the answer is:

frigid

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'cold' is the definition.
(I know that cold can be written as frigid)

'fat-headed and stiff' is the wordplay.
'fat-headed' becomes 'f' (this could be a standard abbreviation of which I'm unaware).
'and' is a charade indicator (letters next to each other).
'stiff' becomes 'rigid' (synonyms).
'f'+'rigid'='FRIGID'

Can you help me to learn more?

(Other definitions for frigid that I've seen before include "Icy" , "Lacking affection or warmth" , "Cold and unresponsive" , "Frosty" , "Very cold in manner" .)

I've seen this clue in the Evening Standard.

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