Break down in lane, say, when travelling around (7)
I believe the answer is:
analyse
'break down' is the definition.
(synonyms)
'lane say when travelling around' is the wordplay.
'when travelling around' indicates anagramming the letters.
'lane'+'say'='lanesay'
'lanesay' is an anagram of 'ANALYSE'.
'in' acts as a link.
(Other definitions for analyse that I've seen before include "Break down into constituent parts" , "Break down into components parts and examine" , "Examine the parts in detail" , "Any ales (anag.)" , "Carefully examine" .)