Must I lie around without energy? Drugs could be the answer (7)
I believe the answer is:
stimuli
'drugs could be the answer' is the definition.
(drugs might stimulate someone)
'must i lie around without energy?' is the wordplay.
'lie around' is an anagram indicator (I've seen 'lying around' mean this (letters lie around in disorder)).
'without energy?' becomes 'li' (I can't justify this - if you can you should give a lot more credence to this answer).
'must'+'i'='musti'
'musti' anagrammed gives 'stimu'.
'stimu'+'li'='STIMULI'
(Other definitions for stimuli that I've seen before include "Things that produce a response" , "They arouse to action" , "Things that cause a response" , "Things provoking reactions" , "Rousing influences" .)