A little lot, note (5)
I believe the answer is:
minim
'note' is the definition.
(type of musical note)
'a little lot' is the wordplay.
'a little' becomes 'mini'.
'lot' becomes 'm'.
'mini'+'m'='MINIM'
(Other definitions for minim that I've seen before include "Note of two crotchets" , "Feature of a score" , "A note in music, half as long as a semi-breve- it's a palindrome" , "Half-semibreve" , "Note equal to two crochets" .)