Computer device offering way of working with purpose (5)
I believe the answer is:
mouse
'computer device' is the definition.
(a computer mouse)
'way of working with purpose' is the wordplay.
'way of working' becomes 'mo' (abbreviation for modus operandi).
'with' says to put letters next to each other.
'purpose' becomes 'use' (synonyms).
'mo'+'use'='MOUSE'
'offering' acts as a link.
(Other definitions for mouse that I've seen before include "Rodent (for computing)" , "Small verminous rodent" , "whose movements are captured on screen" , "Tiny creature" , "Wimp" .)