Really like model not having small figure (5)
I believe the answer is:
digit
'figure' is the definition.
(numerical figure)
'really like model not having small' is the wordplay.
'really like' becomes 'dig' (to dig can mean to appreciate or 'get').
'model' becomes 'sit' (e.g. for a painting).
'not having' suggests deleting specific letters.
'small' becomes 's' (abbreviation - e.g. clothes size).
'sit' with 's' taken out is 'it'.
'dig'+'it'='DIGIT'
(Other definitions for digit that I've seen before include "One's on hand" , "E.g. toe" , "using 0 or 1 for example" , "Single numeral" , "one's given?" .)