The pressure headmistresses have (6)

I believe the answer is:

stress

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

'headmistresses have' is the wordplay.
'have' says the answer is hidden in the clue.
'STRESS' is hidden within 'headmistresses'.

(Other definitions for stress that I've seen before include "Put weight on" , "what causes tension" , "Emphasis on anxiety?" , "Draw attention to" , "Emphasise the pressure" .)

I've seen this clue in the Evening Standard.

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