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It shows some pressure or bias developing (6)

Ross

I believe the answer is:

isobar

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'it shows some pressure' is the definition.
The definition suggests a singular noun which matches the answer.

'or bias developing' is the wordplay.
'developing' is an anagram indicator (letters developed into a new form).
'or'+'bias'='orbias'
'orbias' with letters rearranged gives 'ISOBAR'.

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(Other definitions for isobar that I've seen before include "Line joining places of equal barometric pressure" , "(Map) line of constant atmospheric pressure" , "Evidence of pressure" , "Line of equal barometric pressure on a map" , "Line on map showing barometric pressure" .)

I've seen this clue in The Globe and Mail.
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