Keen to show hesitation about decline? (5)
I believe the answer is:
eager
'keen' is the definition.
(thesaurus)
'hesitation about decline?' is the wordplay.
'hesitation' becomes 'er'.
'about' is an insertion indicator.
'decline?' becomes 'age' (I've seen this in other clues).
'er' placed around 'age' is 'EAGER'.
'to show' is the link.
(Other definitions for eager that I've seen before include "Alert and active type?" , "Fervent" , "Impatient" , "Desperate" , "Low platform" .)