Most men ordered seconds (7)
I believe the answer is:
moments
'seconds' is the definition.
('moment' can be a synonym of 'second')
'most men ordered' is the wordplay.
'ordered' indicates an anagram.
'most'+'men'='mostmen'
'mostmen' anagrammed gives 'MOMENTS'.
(Other definitions for moments that I've seen before include "Points in time" , "Very brief periods of time" , "Short periods" .)