Foot of gigantic bird that’s legendary in the East (7)
I believe the answer is:
trochee
'foot' is the definition.
(I know that trochee is a type of foot)
'gigantic bird that's legendary in the east' is the wordplay.
'gigantic bird' becomes 'roc' (I've seen this before).
'that's legendary' becomes 'the' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'the east' becomes 'E' (abbreviation).
'roc' put into 'the' is 'troche'.
'troche'+'e'='TROCHEE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for trochee that I've seen before include "poetic feature" , "Foot of a stressed and an unstressed syllable" , "Long-short foot in poetry" , "Long-short metrical foot" , "A foot of two syllables, long then short" .)