Intently study for every purpose (6)

I believe the answer is:

peruse

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'intently study' is the definition.
'peruse' can be an answer for 'study' (I've seen this before). I'm unsure of the 'intently' bit.

'every purpose' is the wordplay.
'every' becomes 'per' ('per' means 'for each' or 'for every').
'purpose' becomes 'use' (synonyms).
'per'+'use'='PERUSE'

'for' is the link.

Can you help me to learn more?

(Other definitions for peruse that I've seen before include "Browse, read casually" , "Read or study carefully" , "Scrutinize" , "'Read through, browse (6)'" , "Scan carefully for rupees" .)

I've seen this clue in The Guardian and The Globe and Mail.

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