Bulb put back: large one inside (5)
I believe the answer is:
tulip
'bulb' is the definition.
(I've seen this before)
'put back large one inside' is the wordplay.
'back' is a reversal indicator.
'large' becomes 'L' (eg in clothes sizes).
'one' becomes 'i' (Roman numeral).
'inside' indicates putting letters inside.
'put' in reverse letter order is 'tup'.
'l'+'i'='li'
'tup' going around 'li' is 'TULIP'.
(Other definitions for tulip that I've seen before include "... and another [FLOWER]" , "Flower of the Netherlands" , "Bloomer" , "Liliaceous plant with a spring flower" , "Spring-flowering plant" .)