Crossword Genius

Measure of resistance as I am exercising west of Lambeth walk? (9)

Ross

I believe the answer is:

impedance

I'm a little stuck... Click here to teach me more about this clue!

'measure of resistance' is the definition.
'impedance' can be an answer for 'resistance' (synonyms). I am unsure of the 'measure of' bit.

'i am exercising west of lambeth walk?' is the wordplay.
'i am' becomes 'I'm' (contraction).
'exercising' becomes 'pe' (abbreviation for Physical Education).
'west of lambeth walk?' becomes 'dance' (I can't justify this - if you can you should believe this answer much more).
'im'+'pe'+'dance'='IMPEDANCE'

'as' acts as a link.

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I've seen this clue in The Times.
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