Self-governing Welshwoman's wanting national flowers (8)
I believe the answer is:
freesias
'flowers' is the definition.
(I have seen 'Fragrant flowers ' mean 'freesias' so perhaps 'flowers' could also mean 'freesias')
'self-governing welshwoman's wanting national' is the wordplay.
'self-governing' becomes 'free' (similar in meaning).
'welshwoman's' becomes 'sian's' (common Welsh name).
'wanting' indicates named letters should be taken away (wanting can mean lacking).
'national' becomes 'n' (abbreviation listed in Chambers).
'sians' with 'n' taken away is 'sias'.
'free'+'sias'='FREESIAS'
(Another definition for freesias that I've seen is " See fairs, oddly, for fragrant flowers".)