Please stir when dormant (6)
I believe the answer is:
asleep
'dormant' is the definition.
(similar in meaning)
'please stir' is the wordplay.
'stir' indicates anagramming the letters.
'please' is an anagram of 'ASLEEP'.
'when' is the link.
(Other definitions for asleep that I've seen before include "Inattentive; numbed" , "See, pal strangely is not awake" , "Elapse (anag)" , "not paying attention" , "Napping" .)