Try Livingstone, and pay attention (7)
I believe the answer is:
hearken
'pay attention' is the definition.
(I've seen this in another clue)
'try livingstone' is the wordplay.
'try' becomes 'hear' (as in to try someone in court or hear their case).
'livingstone' becomes 'Ken' (politician Ken Livingstone).
'hear'+'ken'='HEARKEN'
'and' acts as a link.
(Other definitions for hearken that I've seen before include "Old attend" , "Listen in old way" .)