Insincere support for the cheek of Labour?
I believe the answer is:
lip service
'insincere support' is the definition.
(I've seen this before)
'the cheek of labour?' is the wordplay.
'the cheek' becomes 'lip' (lip is a kind of cheek).
'of labour?' becomes 'service' (I can't explain this - if you can you should believe this answer much more).
'lip'+'service'='LIP-SERVICE'
'for' is the link.
Can you help me to learn more?
(Other definitions for lip service that I've seen before include "Insincere support" , "The hypocrisy" , "Unreliable support" , "Insincere praise" , "It may be paid" .)