Bloke at entrance turned round to show piece of identification (7)
I believe the answer is:
nametag
'to show piece of identification' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'bloke at entrance turned' is the wordplay.
'bloke' becomes 'man' (informal term for a man).
'at' means one lot of letters go next to another (I've seen this in other clues).
'entrance' becomes 'gate' (type of entrance).
'turned' says the letters should be written in reverse.
'man' after 'gate' is 'gateman'.
'gateman' reversed gives 'NAMETAG'.
'round' acts as a link.
Can you help me to learn more?
(Other definitions for nametag that I've seen before include "One helps identify" , "It may identify" .)