What are synonyms of clue?

Here are some synonyms for "clue" depending on the context:

General:

* Hint

* Tip

* Indication

* Signal

* Evidence

* Trace

* Lead

* Intimation

* Suggestion

* Pointer

More specific:

* For solving a mystery:

* Evidence

* Proof

* Proof positive

* Key

* Solution

* For understanding something:

* Insight

* Explanation

* Key

* Solution

* For something that is obvious:

* Giveaway

* Dead giveaway

* Sign

* Telltale sign

The best synonym to use will depend on the specific situation and the meaning you want to convey.