Prickly bush can be found in bog or semi-desert (5)
I believe the answer is:
gorse
'prickly bush' is the definition.
(I've seen this in another clue)
'found in bog or semi-desert' is the wordplay.
'found in' indicates a hidden word.
'GORSE' is hidden within 'bog or semi desert'.
'can be' acts as a link.
(Other definitions for gorse that I've seen before include "furs, say" , "Welsh assembly" , "Prickly shrub, furze, whin" , "Wild shrub with yellow flowers and sharp thorns, common on hillsides" , "Spiny yellow-flowered shrub" .)