Crossword Genius

Former politician maybe reading first books: he likes the ones with stickers! (2-7)

Ross

I believe the answer is:

ex-librist

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'books he likes the ones with stickers' is the definition.
The definition suggests a singular noun which matches the answer.

'former politician maybe reading first' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'politician' becomes 'lib'.
'maybe reading' becomes 'R' (one of the three R's of education).
'first' becomes 'ist' (ist resembles 1st).
'ex'+'lib'+'r'+'ist'='EX-LIBRIST'

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I've seen this clue in The Independent.
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