Foot lever rotating the Spanish electric rail system going around Spain (7)
I believe the answer is:
treadle
'foot lever' is the definition.
(synonyms)
'rotating the spanish electric rail system going around spain' is the wordplay.
'rotating' is a reversal indicator.
'the spanish' becomes 'el' ('the' in Spanish).
'electric rail system' becomes 'dart' (I can't explain this - if you can you should give a lot more credence to this answer).
'going around' is an insertion indicator.
'spain' becomes 'e' (abbreviation for Espana).
'el'+'dart'='eldart'
'eldart' going around 'e' is 'eldaert'.
'eldaert' reversed gives 'TREADLE'.
Can you help me to learn more?
(Other definitions for treadle that I've seen before include "Foot lever that works a machine" , "Foot-pedal" , "Rocker in a factory" , "driving mechanism" , "(Machine's) foot-control" .)