Being tense, ramble about buried valuables (5)
I believe the answer is:
trove
'buried valuables' is the definition.
(as in a treasure trove)
'being tense ramble' is the wordplay.
'being tense' becomes 't' (abbreviation used in many dictionaries).
'ramble' becomes 'rove' (synonyms).
't'+'rove'='TROVE'
'about' acts as a link.
(Other definitions for trove that I've seen before include "Store of treasures" , "box of delights?" , "Collection of treasures" , "Cache of treasure for voter" , "Hidden treasure for voter" .)