Welcome making Reg get in excitedly (8)
I believe the answer is:
greeting
'welcome' is the definition.
(I've seen this before)
'reg get in excitedly' is the wordplay.
'excitedly' is an anagram indicator (letters excited or stimulated into a new form).
'reg'+'get'+'in'='reggetin'
'reggetin' anagrammed gives 'GREETING'.
'making' acts as a link.
(Other definitions for greeting that I've seen before include "Words of salutation" , "Word(s) of welcome" , "Scottish weeping or 16 Across" , "causes weeping for some" , "Hello" .)