Unexcited, being in the doldrums? (4)
I believe the answer is:
calm
This clue is a double definition.
'unexcited' is the first definition.
(similar in meaning)
'the doldrums?' is the second definition.
(thesaurus)
'being in' is the link.
(Other definitions for calm that I've seen before include "Imperturbable, soothe" , "Self-possessed" , "Placid, unexcited" , "Placid and unruffled" , "Still and quiet" .)