Act when told not to sit there during crisis (2,9)
I believe the answer is:
do something
'act when' is the definition.
'do something' can be an answer for 'act' (synonyms). I'm not certain of the 'when' bit.
'told not to sit there during crisis' is the wordplay.
I cannot really see how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'during' could be 'in' (e.g. during February means in February) and 'in' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for do something that I've seen is " act".)