Drained father had looked unhappy (7)

I believe the answer is:

frowned

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'looked unhappy' is the definition.
I can't tell whether this definition defines the answer.

'drained father had' is the wordplay.
'drained' means to remove the middle letters.
'had' becomes 'owned' ('own' can be a synonym of 'have').
'father' with its middle removed is 'fr'.
'fr'+'owned'='FROWNED'

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(Other definitions for frowned that I've seen before include "Wrinkled one's forehead" , "Glowered" , "looked worried" .)

I've seen this clue in The Daily Express.

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