Rocket, say, attached to this, pressure crushing crew (5,5)
I believe the answer is:
steam train
'rocket say attached to' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'pressure crushing crew' is the wordplay.
'pressure' becomes 'strain' (I've seen this before).
'crushing' is an insertion indicator (inserted letters are crushed by others).
'crew' becomes 'team' (both can mean a group of colleagues).
'strain' going around 'team' is 'STEAM TRAIN'.
'this' acts as a link.
Can you help me to learn more?
(Other definitions for steam train that I've seen before include "Type of locomotive" , "that runs on-line?" .)