Clue: Rodent with 'orrible smell climbing fruit plant (8)
Answer: MUSQUASH
Explanation: Definition: Rodent
A charade of MU, a reversal ('climbing') of [h]UM (with the initial H dropped as in the clue, ' 'orroble smell') plus SQUASH ('fruit plant', even if the fruit is treated as a vegetable).
 
 A musquash.