A guide to age in a birthday call? (6,4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
annual ring
'a guide' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'age in a birthday call?' is the wordplay.
'age in a birthday' becomes 'annual' (I can't justify this - if you can you should believe this answer much more).
'call?' becomes 'ring' (telephone call).
'annual'+'ring'='ANNUAL RING'
'to' acts as a link.
Can you help me to learn more?
(Another definition for annual ring that I've seen is " sign of age".)