Dad's initially troubled history (4)

I believe the answer is:

past

'history' is the definition.
(I've seen this before)

'dad's initially troubled' is the wordplay.
'dad's' becomes 'pa's' ('pa' can be a synonym of 'dad').
'initially' indicates taking the first letters.
The initial letter of 'troubled' is 't'.
'pas'+'t'='PAST'

(Other definitions for past that I've seen before include "over and done with" , "Ended" , "A person's earlier life history" , "historical times" , "Second visitor in 5 [A CHRISTMAS CAROL]" .)

I've seen this clue in the Evening Standard.

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