One of those involved in underground movement, for example, recalls writing most of the proposed legislation (6)
I believe the answer is:
gerbil
'one of those involved in underground movement' is the definition.
I can't tell whether this definition defines the answer.
'example recalls writing most of the proposed legislation' is the wordplay.
'example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'recalls' is a reversal indicator (I've seen 'recalled' mean this).
'writing' becomes 'r' (one of the traditional three R's of education).
'most of' means to remove the last letter.
'the proposed legislation' becomes 'bill'.
'eg' back-to-front is 'ge'.
'bill' with its final letter taken off is 'bil'.
'ge'+'r'+'bil'='GERBIL'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for gerbil that I've seen before include "Burrowing mouse-like rodent" , "Small desert dweller" , "Leg plus rib of a mouse-like desert rodent" , "Desert rodent, often kept as a pet" , "Burrower with a bushy tail" .)