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Because engineers are worthy of credit (7)

Ross

I believe the answer is:

sincere

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'worthy of credit' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

'because engineers' is the wordplay.
'because' becomes 'since' (I've seen this before).
'engineers' becomes 're' (abbreviation for Royal Engineers).
'since'+'re'='SINCERE'

'are' is the link.

Can you help me to learn more?

(Other definitions for sincere that I've seen before include "like informal correspondents?", "Unfeigned, genuine", "straightforward", "Perfect", "Pure".)

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