On the line Keats composed after a time (2,5)
I believe the answer is:
at stake
'on the line' is the definition.
(putting something on the line puts it at stake)
'keats composed after a time' is the wordplay.
'composed' is an anagram indicator.
'after' says to put letters next to each other.
'time' becomes 't' (abbreviation).
'keats' is an anagram of 'stake'.
'a'+'t'='at'
'stake' after 'at' is 'AT STAKE'.
(Other definitions for at stake that I've seen before include "Being risked, depending on outcome of event" , "In danger; at issue" , "To be won or lost" , "where many martyrs died" , "Being risked or bet on" .)