Cave is reached around end of tour (6)
I believe the answer is:
grotto
'cave' is the definition.
(I've seen this before)
'reached around end of tour' is the wordplay.
'reached' becomes 'gotto' (getting to is a kind of reaching).
'around' is an insertion indicator.
'end of' suggests the final letters.
The last letter of 'tour' is 'r'.
'gotto' enclosing 'r' is 'GROTTO'.
'is' is the link.
(Other definitions for grotto that I've seen before include "Ornamental cave" , "fancy underground area" , "Small cave as at Lourdes" , "Small cave, perhaps with religious connotations" , "Attractive natural, or artificial, cave" .)