Hair concealing one grand female — a beastly type (7)
I believe the answer is:
tigress
'female a beastly type' is the definition.
(female tiger)
'hair concealing one grand' is the wordplay.
'hair' becomes 'tress' (tress is a kind of hair).
'concealing' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'grand' becomes 'g' (G is short for grand as in a thousand).
'i'+'g'='ig'
'tress' placed around 'ig' is 'TIGRESS'.
(Other definitions for tigress that I've seen before include "Large she-cat" , "Striped feline female" , "Fierce woman" , "Amazon, say" , "Wild cat (female)" .)