They need some pluck when the stairs are broken (6)
I believe the answer is:
sitars
'they need some pluck when' is the definition.
The definition suggests an adverb but the answer is not.
'stairs are broken' is the wordplay.
'are broken' indicates an anagram.
'stairs' anagrammed gives 'SITARS'.
'the' is the link.
Can you help me to learn more?
(Other definitions for sitars that I've seen before include "Indian stringed instruments" , "Instruments from India" , "Music makers" .)