Go over need for measure of conductivity (6,3)
I believe the answer is:
energy gap
'measure of conductivity' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'go over need' is the wordplay.
'go' becomes 'energy' (I've seen this before).
'over need' becomes 'gap' (I can't justify this - if you can you should believe this answer much more).
'energy'+'gap'='ENERGY GAP'
'for' is the link.
Can you help me to learn more?
I've seen this clue in The Times.
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