Praise remark about line in page one (10)
I believe the answer is:
compliment
'praise' is the definition.
(compliment is a kind of praise)
'remark about line in page one' is the wordplay.
'remark' becomes 'comment' (synonyms).
'about' means one lot of letters goes inside another.
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' is an insertion indicator.
'page one' becomes 'pi' (resembles pc, page one).
'l' going into 'pi' is 'pli'.
'comment' going around 'pli' is 'COMPLIMENT'.
(Other definitions for compliment that I've seen before include "Politely congratulate" , "pat on the back" , "Word of praise" , "tribute" , "Expression of polite admiration" .)