Wide part of foot caught by light immobilising device (5,5)
I believe the answer is:
wheel clamp
'immobilising device' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'wide part of foot caught by light' is the wordplay.
'wide' becomes 'w' (abbreviation e.g. in cricket).
'part of foot' becomes 'heel' (I've seen this before).
'caught' becomes 'c' (cricket abbreviation).
'by light' becomes 'lamp' (lamp is a kind of light. I am not sure about the 'by' bit.**).
'w'+'heel'+'c'+'lamp'='WHEEL-CLAMP'
Can you help me to learn more?
(Another definition for wheel clamp that I've seen is " Parker's dread".)