A peace trip planned to grow in value (10)
I believe the answer is:
appreciate
'grow in value' is the definition.
(I've seen this before)
'a peace trip planned' is the wordplay.
'planned' indicates an anagram.
'peace'+'trip'='peacetrip'
'peacetrip' anagrammed gives 'ppreciate'.
'a'+'ppreciate'='APPRECIATE'
'to' is the link.
(Other definitions for appreciate that I've seen before include "Be fully aware of" , "Enjoy" , "Take full account of" , "Feel grateful" , "Grow in value" .)