Fierce female in flower firm providing deliveries (6)
I believe the answer is:
amazon
This might be a double definition.
'fierce female' is the first definition.
'amazon' can be an answer for 'female' (amazon is a kind of female). I'm unsure of the 'fierce' bit.
'flower firm providing deliveries' is the second definition.
'amazon' can be an answer for 'flower' (I've seen this before). I am not certain of the 'firm providing deliveries' bit.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for amazon that I've seen before include "Mighty river of S America, or tough woman" , "tropical fish swimming here" , "Encourage, ask" , "Female warrior of Greek myth" , "Mythical woman warrior and river" .)