Garland that is large put up (3)
I believe the answer is:
lei
'garland' is the definition.
(synonyms)
'that is large put up' is the wordplay.
'that is' becomes 'ie' (synonyms).
'large' becomes 'l'.
'put up' shows that the letters should be reversed in order.
'ie'+'l'='iel'
'iel' in reverse letter order is 'LEI'.
(Other definitions for lei that I've seen before include "Garland of flowers in Hawaii" , "Floral decoration" , "Necklace of tropical flowers" , "Hawaiin flower garland" , "Flower garland of Hawaii" .)