Flag of usual kind (8)
I believe the answer is:
standard
I believe this is a triple definition!
'flag' is the first definition.
(I know that standard is a type of flag)
'of' acts as a link.
'usual' is the second definition.
(synonyms)
'kind' is the third definition.
(I have seen 'kind of lamp' mean 'standard' so perhaps 'kind' could also mean 'standard')
(Other definitions for standard that I've seen before include "Classic" , "Normal quality" , "Reference point against which other things can be evaluated" , "Normal; flag" , "Normal - colours" .)