Interrogates trainers (5)
I believe the answer is:
pumps
This clue could be a double definition.
'interrogates' is the first definition.
(I've seen this in another clue)
'trainers' is the second definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?
Can you help me to learn more?
(Other definitions for pumps that I've seen before include "Dancing shoes - may be manned!" , "Light dancing shoes - force air into" , "Questions persistently; light shoes" , "Forces liquid to move; light shoes" , "Cycle attachments" .)