Crocodile’s front leg shows scale (5)
I believe the answer is:
climb
'scale' is the definition.
(I know that scale is a more specific form of climb)
'crocodile's front leg' is the wordplay.
'front' indicates taking the first letters.
'leg' becomes 'limb' (I've seen this before).
The initial letter of 'crocodiles' is 'c'.
'c'+'limb'='CLIMB'
'shows' is the link.
(Other definitions for climb that I've seen before include "Use hands and feet to rise" , "Ascend - ascent" , "Slope upwards" , "Scale or clamber" , "Ascend, escalate" .)