### Clue: Son went on Big Dipper in these? (7)
### Answer: SPEEDOS 
 ### Explanation: Definition: Dipper in these
 S(abbrev. for "son") + PEED(alternative to "pissed"/went) **placed above**(on) OS(abbrev. for "outsize" in reference to clothing/big).
Defn: What a dipper/one who immerses oneself in a liquid, say, water, would be wearing/be in.