Excited chaperone forgets pen for ancient poet (6)
I believe the answer is:
horace
'ancient poet' is the definition.
(I've seen this in another clue)
'excited chaperone forgets pen' is the wordplay.
'excited' indicates anagramming the letters.
'forgets' is a deletion indicator.
'chaperone' with 'pen' taken away is 'charoe'.
'charoe' is an anagram of 'HORACE'.
'for' is the link.
(Other definitions for horace that I've seen before include "- Walpole, eighteenth century English author" , "Roman poet; -- Walpole" , "Is it a chore to read this old Roman poet?" , "Roman lyric poet, d.8BC -- a chore (anag)" , "Latin ode writer" .)