### Clue: Son with worries first for pets (6)
### Answer: CARESS 
 ### Explanation: Definition: pets
  CARES(concerns,*worries*) before(*first*) S(*$$s$$on*).
Defn:  What lovers do to each other.  I don't think "pets" can be used as a noun in this sense, so there appears to be a mismatch between the singular verb "pets" and the plural verb "caress".