Brownie's photographs I initially enlarged (5)
I believe the answer is:
pixie
'brownie's' is the definition.
('pixie' can be a synonym of 'brownie')
'photographs i initially enlarged' is the wordplay.
'photographs' becomes 'pix' (abbreviation of 'pictures').
'initially' says to take the initial letters.
The first letter of 'enlarged' is 'e'.
'pix'+'i'+'e'='PIXIE'
(Other definitions for pixie that I've seen before include "Pointy-eared dwarf" , "Elf, imp" , "Creature like fairy or elf" , "Sprite" , "Mischievous fairy" .)