Beat president losing power in petulant display (7)
I believe the answer is:
tantrum
'display' is the definition.
(I have seen 'Display of temper' mean 'tantrum' so perhaps 'display' could also mean 'tantrum')
'beat president losing power in petulant' is the wordplay.
I cannot quite understand how this works, but
'beat' could be 'tan' (tan can mean to beat or hit) and 'tan' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tantrum that I've seen before include "Paddy" , "Frenzy" , "Fit - pet" , "Hissy fit" , "Pet, temper" .)