Number really like working with computers! (5)
I believe the answer is:
digit
'number' is the definition.
(I know that digit is a type of integer)
'really like working with computers' is the wordplay.
'really like' becomes 'dig' (to dig can mean to appreciate or 'get').
'working with computers' becomes 'IT' (information technology).
'dig'+'it'='DIGIT'
(Other definitions for digit that I've seen before include "a number less than ten" , "One in ten, say" , "zero, one, two, three, four, five, six, seven, eight, or nine" , "one of several at hand" , "Finger, thumb or toe" .)