Worker follows power line in factory (5)
I believe the answer is:
plant
'factory' is the definition.
(I've seen this before)
'worker follows power line' is the wordplay.
'worker' becomes 'ant' (worker is a type of ant).
'follows' says to put letters next to each other.
'power' becomes 'p'.
'line' becomes 'l'.
'p'+'l'='pl'
'ant' put after 'pl' is 'PLANT'.
'in' is the link.
(Other definitions for plant that I've seen before include "Growing organism - industrial buildings" , "Living organism, such as a shrub" , "Put in soil" , "Factory equipment" , "sold by garden centre" .)