Crossword Genius

Hormone gets one frisky - or upset inside? (9)

Ross

I believe the answer is:

oestrogen

'hormone' is the definition.
(I know that oestrogen is a type of hormone)

'gets one frisky or upset inside?' is the wordplay.
'frisky' indicates anagramming the letters.
'upset' indicates anagramming the letters.
'inside?' is an insertion indicator.
'or' with letters rearranged gives 'ro'.
'gets'+'one'='getsone'
'getsone' with letters rearranged gives 'oestgen'.
'oestgen' enclosing 'ro' is 'OESTROGEN'.

(Another definition for oestrogen that I've seen is " Hormone".)

I've seen this clue in The Independent.
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