IT billionaire cut barrier (4)
I believe the answer is:
gate
'barrier' is the definition.
(I know that gate is a type of movable barrier)
'it billionaire cut' is the wordplay.
I cannot quite understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
The remaining letters 'gae' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for gate that I've seen before include "Barrier, exit" , "Facility in airport" , "Access here" , "Narrow opening" , "Entrance (money)" .)