Breakdown entitles man to become emotional (11)
I believe the answer is:
sentimental
'emotional' is the definition.
('sentimental' can be similar in meaning to 'emotional')
'breakdown entitles man' is the wordplay.
'breakdown' is an anagram indicator.
'entitles'+'man'='entitlesman'
'entitlesman' is an anagram of 'SENTIMENTAL'.
'to become' acts as a link.
(Other definitions for sentimental that I've seen before include "Appealing to emotion rather than actuality" , "Moved by fond memories of the past" , "Feeling much" , "Soft-hearted; romantic" , "Expressing tender emotions" .)