Old instrument needed as her boot is awkward (7)
I believe the answer is:
theorbo
'old instrument' is the definition.
(I've seen this before)
'her boot is awkward' is the wordplay.
'is awkward' indicates an anagram.
'her'+'boot'='herboot'
'herboot' anagrammed gives 'THEORBO'.
'needed as' acts as a link.
(Other definitions for theorbo that I've seen before include "One played" , "Old music maker" , "Old lute with two necks" , "Antique instrument" , "C seventeen - eighteen member of lute family" .)