Crossword Genius

Instructive sort of book couple picked up in house (3,2)

Ross

I believe the answer is:

how-to

'instructive sort of book' is the definition.

'couple picked up in house' is the wordplay.
'couple' becomes 'two' (I've seen this before).
'picked up' says the letters should be written backwards.
'in' is an insertion indicator.
'house' becomes 'ho' (abbreviation for house).
'two' reversed gives 'owt'.
'owt' put inside 'ho' is 'HOW-TO'.

I've seen this clue in The Guardian.
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