Unexciting team lost (4)
I believe the answer is:
tame
'unexciting' is the definition.
('tame' can be similar in meaning to 'unexciting')
'team lost' is the wordplay.
'lost' indicates an anagram.
'team' anagrammed gives 'TAME'.
(Other definitions for tame that I've seen before include "Not exciting; cooperative" , "Domesticated - dull" , "Submissive -- pedestrian" , "Domesticated, not wild" , "Not wild, unexciting" .)