Think well of a very quiet ramble (7)
I believe the answer is:
approve
'think well of' is the definition.
(I've seen this before)
'a very quiet ramble' is the wordplay.
'very quiet' becomes 'pp' (musical abbreviation for pianissimo).
'ramble' becomes 'rove' (synonyms).
'a'+'pp'+'rove'='APPROVE'
(Other definitions for approve that I've seen before include "Sanction, ratify" , "Think highly of - sanction" , "Regard with favour" , "Sanction, authorise" , "Give the green light" .)