One kilo carried by that woman backpacker (5)
I believe the answer is:
hiker
'backpacker' is the definition.
(thesaurus)
'one kilo carried by that woman' is the wordplay.
'one kilo' becomes 'k' (phonetic alphabet: alpha, bravo, charlie etc.).
'carried by' means one lot of letters goes inside another.
'that woman' becomes 'hier' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'k' going inside 'hier' is 'HIKER'.
Can you help me to learn more?
(Other definitions for hiker that I've seen before include "One rambling" , "Walker for pleasure" , "Someone walking (with backpack?)" , "I could be on the trail" , "Distance walker" .)