Especially (2,10)
There are a few possibilities for this:
in particular
'especially' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for particularly that I've seen before include "With special reference to" , "Very much" , "To an uncommon degree" , "Especially" , "In a marked way" .)
'especially' is the definition.
(synonyms)
This is all the clue.
(Other definitions for in particular that I've seen before include "Specifically" , "Especially" .)