Online agent gets notice? (4)
I believe the answer is:
espy
'notice?' is the definition.
(I've seen this before)
'online agent' is the wordplay.
'online' becomes 'e' (abbreviation for electronic, e.g. in ecommerce).
'agent' becomes 'spy' (spy is a kind of agent).
'e'+'spy'='ESPY'
'gets' is the link.
(Other definitions for espy that I've seen before include "Detect" , "Catch a glimpse of" , "Spot, notice" , "Discern" , "Catch sight of (poetic)" .)