Caught greeting in grotto (4)
I believe the answer is:
cave
'grotto' is the definition.
(thesaurus)
'caught greeting' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'greeting' becomes 'ave' (I've seen this before).
'c'+'ave'='CAVE'
'in' acts as a link.
(Other definitions for cave that I've seen before include "Hollow in a cliff or underground" , "Natural underground space" , "Troglodyte's home" , "Subject of speleology" , "Natural subterranean opening" .)