Crossword Genius

When prices jump or vault, it's said makers will be twitchy and tense (7,6)

Ross

I believe the answer is:

nervous strain

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'when prices jump or vault it's said makers will' is the definition.
I can't judge whether this defines the answer.

'twitchy and tense' is the wordplay.
'twitchy' becomes 'nervous' (I've seen this before).
'and' means one lot of letters go next to another.
'tense' becomes 'strain' (synonyms).
'nervous'+'strain'='NERVOUS STRAIN'

'be' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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