Trainer's first to look at factory's exercise equipment (9)
I believe the answer is:
treadmill
'exercise equipment' is the definition.
'trainer's first to look at factory's' is the wordplay.
'trainer's first' becomes 't' (rst letter of 'trainer').
'to' is a charade indicator (letters next to each other).
'look' becomes 'read' (I've seen this in other clues).
'at' says to put letters next to each other.
'factory' becomes 'mill' (synonyms).
't'+'read'+'mill'='TREADMILL'
(Other definitions for treadmill that I've seen before include "Dull routine" , "Laborious routine" , "tedious work" , "hard labour" , "Boring or unending job" .)