Wandering on pier, tearing around (13)
I believe the answer is:
peregrination
'wandering' is the definition.
(I've seen this before)
'on pier tearing around' is the wordplay.
'around' indicates anagramming the letters.
'on'+'pier'+'tearing'='onpiertearing'
'onpiertearing' with letters rearranged gives 'PEREGRINATION'.
(Other definitions for peregrination that I've seen before include "Globe-trotting" , "Travelling about" , "wandering" , "Long meandering journey" .)