Travel about carrying small shrub (5)
I believe the answer is:
gorse
'shrub' is the definition.
(gorse is a kind of shrub)
'travel about carrying small' is the wordplay.
'travel' becomes 'go' (synonyms).
'about' becomes 're' (regarding).
'carrying' indicates putting letters inside.
'small' becomes 's' (abbreviation - e.g. clothes size).
're' placed around 's' is 'rse'.
'go'+'rse'='GORSE'
(Other definitions for gorse that I've seen before include "I'm always blooming" , "Wild evergreen shrub with yellow flowers and sharp thorns" , "Prickly shrub, furze, whin" , "Moorland shrub" , "Spiny evergreen shrub" .)